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MCQs

Total Questions : 275 | Page 24 of 28 pages
Question 231. The microprocessor issues ALE during first T-state of
  1.     memory WRITE cycle only
  2.     fetch cycle only
  3.     memory READ cycle only
  4.     every machine cycle
 Discuss Question
Answer: Option D. ->  every machine cycle
Question 232. The data lines of 8085 microprocessor are multiplexed with
  1.     higher order address lines
  2.    None of these
  3.     lower order address lines
  4.     status lines
 Discuss Question
Answer: Option C. ->  lower order address lines
Question 233. During OPCODE fetch the state of S0 and S1 is
  1.     00
  2.     01
  3.     11
  4.     10
 Discuss Question
Answer: Option C. ->  11
Question 234. RST 3 instruction will cause the processor to branch to the location
  1.     0024H
  2.     0000H
  3.     0028H
  4.     0018H
 Discuss Question
Answer: Option D. ->  0018H
Question 235. The content of the A15-A8 (higher order address lines) while executing “IN 8-bit port address” instruction are
  1.     all bits reset (i.e. 00H)
  2.     same as the content of A7-A0
  3.     all bits set (i.e. FFH)
  4.     irrelevant
 Discuss Question
Answer: Option B. ->  same as the content of A7-A0
Question 236. Which of the following instruction will never affect the zero flag?
  1.     ORA R
  2.     DCX Rp
  3.     DCR R
  4.     XRA R
 Discuss Question
Answer: Option B. ->  DCX Rp
Question 237. Which one of the following ICs is used to interface keyboard and display?
  1.     8253
  2.     8251
  3.     8259
  4.     8279
 Discuss Question
Answer: Option D. ->  8279
Question 238. Which one of the following interrupt/interrupts is/are only level triggering?
  1.     RST 5.5
  2.     RST 6.5
  3.     both ‘a’ and ‘b’
  4.     TRAP
 Discuss Question
Answer: Option C. ->  both ‘a’ and ‘b’
Question 239. Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value?
  1.     MOV A, 00H
  2.     CLR A
  3.     SUB A
  4.     ORA A
 Discuss Question
Answer: Option C. ->  SUB A
Question 240. In order to save accumulator value on the stack, which of the following instruction may be used
  1.     PUSH A
  2.     PUSH SP
  3.     POP PSW
  4.     PUSH PSW
 Discuss Question
Answer: Option D. ->  PUSH PSW

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